Furnace grate bar



Aug., 7, 1923. l mmm@ H. J. WEBSTER FURNAGE 'GRATEl BAR Filed March 30. 1922 @tbox ne t4 supported by said grate bar.

patented Aug. 7, 1923.

HOWARD J. WEBSTER, OF PHILADELPHIA, PENNSYLVANIA..

FURNACE GRATE BAR.

Application filed March 30, 1922. Serial No. 548,063.

To all whom t mag/'concern y Be it known that I, Howann J. lhnnsrnu,

a citizen of the United States, residing at Philadelphia, inthe county of Philadelphia and State of Pennsylvania, have invented certain new 'and useful Improvements in Furnace Grate Bars, of which the following is a specification. y

n This invention relates to fuel chambers of furnaces.

. The objects of the invention are:

First, to construct a grate barwhich is particularly adapted for burning smaller `sizes of anthracite and other low grade fuel at ahigh rate of combustion.

p Second, to so construct` and arrange a se ries of slits within recesses formed in the upper surface of vthe grate bar as to produce and deliveraseriesvof separated fanshaped liets ofV air through the fuel bed which do not in any way elevate a low grade fuel above said bed and supply the requisite amount of air for a high rate of combustion` i i Third, to so construct and arrange the .re-

cesses or depressionsin the upper grate bar' surface and the slits [within the recesses as to not only give the fan-shaped air delivery jets'fa greater distance toV spread j before meeting the fuel bed but at the same time the ash pockets formed by said 'recesses properly protect the' upper surface` of the grate bar adjacent vthe highly heated fuel Fourth, to construct and dispose the recesses in the upper surface of the grate bar and arrange the slits in said recesses so that the action of a slicing bar or otherlfurnace "firing device upon the fuel will not-force,'-

pack or embed the fine dust of the fuel or ashes into said slits or recesses, thereby destroying the proper'combustion of the fuelV and efficient operation of the furnace.

Fifth, to so `construct and' arrange the ele-` ments comprising the grate bar, in order to eliminate thecornmonly used pin hole noz.- ale arrangement and consequent diverging projected Yjet action of the'air through the fuel bed, which projected jets of air set up a reverse vortex action causing the light fuel to be `elevated far` above the fuel bed level and into the combustion space and forming a series of geys'ers untilnally sections of the fuel bed-burn'into holes without fuel,

grate bars. for l thereby destroying the uniform, maximum andefiicient combustion of said fuel for a' given area of grate surface. y Y A Sixth, to construct` a grate bar which twill tend to preserve a uniform thickness yof fuel Y bed throughout the grate area, land atrthev same time a constant air pressure-in the ashk pit, and said air pressure being only varied tochange or control the rate of combustionv of the fuel. v v

. Seventh, other objects and advantages of the invention will appear from the detailed construction and arrangement of vparts and mode of operation to be hereinafter given.

The invention consists of structural characteristics and relative arrangement of ele# ments as will be hereinafter more fully described andparticularly pointed out vin the appended claims. .A 1

In the drawings, in which similar refer-f ence characters indicate the `same parts in the several figures:

Figure 1 is a longitudinal vertical section on line 1,-1 -of Figure r2 of a portion of a furnace fuelohamber provided with the improved grate bar. i y y Figure 2 is a top plan view of a `furnace with the improved grate bar, and

' Figure 3 is an enlarged sectional viewconnection with this class vof devices, and,

formv no part of the present invention.

14 is the improved grate bar sustained fon said supports 12 and 13 and having the upper or fire surface section 15 and the longitudinal'ribs 16 for strengthening and stiffening said bar'lh said' ribs` lr6-being cut away at their outer and under edges to form ledges 17 adapted to rest on' said supports 12and13; I y.

In the upper or fire surface section.v 15 of the grate bar are provideda plurality or a lseries of separated and yelongated Vnarrow depressions or recesses 18 which are preferably arranged transversely of the longitudinal axis of said grate bar 111;l and extend to within a-short distance of the upper edges circular `in--cross section in a longitudinalf plane normal to the upper surface and rounded at their ends 2O as illustrated.

At eagchofisaid depressions or recesses 18 isV provided `a slit'ror elongated opening 21 extending transversely and entirely across the upper or'fre surface section 15 Vand from the bottom of each of said depressions or recesses 18 to and through theunderside surface or face 22v of the upper fire surface section 15 yforl purposes to be here- 1 inafter described.

The sides ,19; 195er are grate barfarsfprf-a videdvvithv ay narrow yor slight proj ection'ZB having a.` longitudinal groove 24, a'sshown-V ribs depending from the underside QQoffthe v `fire surface section154 and extending transf veirsely ofv andthe entir'ewidth ofthe'grate bar" between] the upper portion of they longitudinal ribs '16: This'constructipn and= arrangementy fl ribs or ivebs 25' 'not' only strengthens vbutj at the same time assiststo conveyfthefheat doivn" from the upfpirfif' surface section 15v into a space provided' vvithv cool air,'thereby'reducing the' expansion of the top surface ofthe grate bary to a minimum levier (average temperature and at thesame time pre-heating the air ,passingthrough the fuely bed.

The parts being constructed and arranged as shovvnvvithA aj bed of :fuel resting on the', Y upper or fire surface section15,'ivh`en a' draft i of air is passing from the -ash pit and' up'- vvard through the, slits" V21 in the grate bar,

said air issues from the slits and is delivered in fan-shaped ,jets through the fuel bed l Without disturbing or raising the low grade orfine yfuel from' the gratebar, and at the vby effecting a greater capacity or horse-1y power per-square footof gratey surface than Sm@ time 'insuring a. proper and uniform supply of oxygen over the entire grate for a 'high' and quickrate of combustion, therewith Lvgratefbars in which @tennis fed through eirc'ular openings'orp'in liole noz-A zleS;V

l The arrangement 'of the sides 19, projeC- tions 23,' grooves 24A and slits 421, also prevents surface expansion of the upper grateV surface andreduees the transverse and lon-V gitudinal expansion of the gratebarto` a minimum', thereby"increasingnot only the life ofthe grate but also v'the parts forming the 'firel chamberof the furnace. y

will also lbe""'seen.\that `When a 'slicingl bar orother firing tool Vis applied to the fuel v be,sai'd 'bar 'will ne"cesserily be 'required te rest on' theupperk surface fof thel grate bar and Vwill*thereby" be' prevented 'from forcing,

paekingor embedding the ii'ne 'fuel for ashes intothe' 'slits 211 orlree'eses 185 therebynisur;

ing a constant and uniform feedV of air and combustion of fuel at all'times throughout the entire areaiof the gratesurface.

From the foregoing f description of the construction and arrangement of parts and mode of operation, itwvill be readily seen that a grate'barhas'been'devised which comprises aminimum number of highly efficient cooperating elements of simple construction,

vvhichV can beV cheaply manufactured and* readily installed or assembled or disassem bled oryrenevved ata minimum of expense and Without theuse of skilledlabor or spe-v cialtoolsi Y 1 j 'Y It Will also be seen'that all the obj Vec''tsV and 5 advantagesY recited' in the VV'statement of in#-V vention have vbeen fully Car'riedut; and` Y While the preferred form has"` been shoivn" and described, it is to be understoodjthat manyV changes ivill suggest themselves 'Without in .any Way changing `the material-features of construction or departingv frn'i'the spirit of the invention asE expressed in"j the claims. Y Y

Whatl claim i'sfzj- 1. A furnace grate bar having a fire surface sectionprovide'd with a series fsepafl rated depressions or recesses inits upper" faee, and a continuous 'slit in each'of and"V extending the entire length of the depres# sions vor recesses of the firesurface section and extending through? the underface'of the firey surface section.

vZ, A furnace grate bar' having aL ire's'urface section provided with a series()f'se`p`a ratedelongated --depres'sion's' or recesses in its upper face,"l anda slit' in each of 'thefd'e-v pressions or vrecesses of the fire4 surface 'section and extending' from the bottom" of the depressions or recesses through the under face of the fire surface seetion.'

3. A 'furnace grate ba-r having a horizontal iirefsurface sectionprovided ,with a series of separate'lr elongatedland narrow-de'- pressiowns or recesses in its upper face, and aV slit in' the bottomy of each of the vdepressions or recesses of the fire surface section anderT tending from' the bottom of the i depressions orfrec'esses through theV 'under face' ofthe fire Vsurface section. Y v i 4. A furnace grate'bar having a horizontalffire surface section provided'vvith-"a series of separated 'elongated depres-sionsl or recesses 'in its upper face and"arranged transversely to the longitudinalaX-is fof the grate b`ar, 'and a slit inthe bottom of eachof. the depressions or' recesses 'of thefiresurfaee l section 'and extending .fromA the 5bottom* of the depressions or recesses 'through the under. face ofthe fire surface section; Y

45. A A furnace grate bar vlhaving a horizon tal fire surface section provided"withrseriesi'l of separated elongated depressions `or-vv recesse's 'in its upper V"face and'sentircirc-111erVV in cross section; and a "slitA in'and substaniv tially the entire length of each of the depressions or recesses of the fire surface section and extending from the bottom of the depressions or recesses through the under face of the fire surface section.

6. A furnace grate bar having a horizontal fire surface section provided with a series of separated elongated depressions or recesses in its upper face and semi-circular in cross section in a plane passing through the longitudinal axis of the grate bar, and a slit in and substantially the entire length of each of the depressions or recesses of the lire surface section and extending from the bottom of the depressions or recesses through the under face of the fire surface section.

A furnace grate bar having a horizontal fire surface section provided with a series of separa-ted elongated depressions or recesses in its upper face and arranged transversely to the longitudinal axis of the grate bar and'extending to near the side edges of said bar, and a slit in the bottom of each of the depressions or reces-ses of the lire surface section and extending from the bottom of the depressions or recesses through the under face of the hre surface section.

8. A furnace grate bar having a horizontal fire surface section having a spacing projection on each of its sides and provided With a series of separated elongated de-y pressions or recesses in its upper face, and a slit in each of the depressions or recesses of the fire surface section vand extending from the bottom of the depressions or recesses through the under face of the re surface section.

9. A furnace grate bar having a fire surface section provided with a series of sepau rated depressions or recesses in its upper face, and a slit in each of the depressions or recesses of the fire surface section and vextending across the upper face and through the under face of the lire surface section.

10. A furnace grate bar having a fire surface section provided with a series of separated elongated depressions or recesses in its upper face, and a slit in each of the depressions or recesses of the fire surface section and extending across the upper face of the fire surface section and from the bottom of the depressions or recesses through the under face of the fire surface section.

l1. A furnace grate bar having a horizontal fire surface section provided with a series of separated elongated and narrow depressions or recesses in its upper face, and a slit in the bottom of each of the depressions or recesses of the lire surface section and extending across the upper face of the fire surface section, and from the bottom of the depressions or recesses through the under face of the fire surface section.

l2. A furnace grate bar having a horizontal fire surface section provided With a series of separated elongated depressions or recesses in its upper face and arranged transversely to the longitudinal axis of the grate bar, and a slit in the bottom of each of the depressions or lrecesses of the fire surface section and'extending across the upper face of the fire surface section and from the bottom of the depressions or recesses through the under face of the fire surface section.

In testimony whereof l afix my signature.

HQWARD J. WEBSTER. 

